How to represent integer values ​​in JavaScript

JavaScript is a high-level programming language that can be used to create interactive web pages and web applications. The data types are mainly divided into three categories: numeric type, string type and Boolean type. Among them, numeric data types include integers and floating point numbers. This article mainly introduces the representation of integer values ​​in JavaScript.

In JavaScript, integers can be represented in decimal, octal and hexadecimal. Below we introduce the representation of integer values ​​in different bases.

1. Decimal notation

The most common one in JavaScript is decimal notation, which is represented by the numbers 0-9. For example, the integer 10 is 10, and the integer 100 is 100. In JavaScript, integers are represented in decimal by default.

2. Octal notation

In JavaScript, use the prefix 0 to indicate that a number is an octal number. For example, the integer 8 can be represented as 010, which in JavaScript is an octal number. Digits in octal numbers can only be 0-7, otherwise they will be parsed as decimal numbers.

3. Hexadecimal notation

In JavaScript, use the prefix 0x to indicate that a number is a hexadecimal number. For example, the integer 255 can be represented as 0xff. In JavaScript, this number is a hexadecimal number. The digits in hexadecimal include 0-9 and a-f (or A-F), which correspond to 10-15 respectively.

In addition to the three base representations mentioned above, JavaScript also supports exponential representation. Exponential notation can conveniently represent very large or very small decimal numbers, such as 1.23e-6 for decimals less than 1.

In addition, integers in JavaScript default to "number" type data, which means that they are allowed to contain decimal parts. However, unlike other programming languages, when integers in JavaScript are calculated, their accuracy depends on the specific calculation, and there may be accuracy errors.

To summarize, integer values ​​in JavaScript can be represented in decimal, octal and hexadecimal, and exponential notation is also supported. Since the precision of integers in JavaScript is affected by the calculation method, you need to pay attention to precision issues when using it.

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